On 25.10.16 14:42, Alexandr Scherbatiy wrote:
When the Swing repaint manager paints Swing to a separate off-screen
buffer the root window is not painted. So in case of non-opaque root
window having transparent background the repainted buffer area
transparency is not restored and previously visible Swing components
can remain visible.
The solution is to paint the root window's background to the repainted
area in case the root window is non-opaque.
Should the previous composite be restored after the rect filling?
Did you check that if the rootpane background contain non-zero alpha it
does not draws twice? The first one when the the root will be draw
itself and the second time in the new code when the component will be
drawn? probably backbuffer should be initialized to Color(0,0,0,0) instead?
--
Best regards, Sergey.
